Synthesis, structure, and corrosion inhibiting properties of phenylacetato-rare earth(III) complexes

Mottram, Eleanor, Hamilton, Sophie, Moon, Joshua S., Wang, Jun, Bousrez, Guillaume, Somers, Anthony E., Deacon, Glen B., and Junk, Peter C. (2020) Synthesis, structure, and corrosion inhibiting properties of phenylacetato-rare earth(III) complexes. Journal of Coordination Chemistry, 73 (17-19). pp. 2677-2697.

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Abstract

A series of phenylacetato (PhAc) rare earth complexes with aqua and 2,2 '-bipyridine (bpy) co-ligands have been synthesized by metathesis reactions in water. Structures of the aqua complexes [RE(PhAc)(3)(H2O)] (n) (RE = Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho), {[Lu-4(PhAc)(12)(H2O)(2)]center dot 1.5H(2)O} (n) and the bpy derivatives [RE(PhAc)(3)(bpy)](2) (RE = Y, Nd, Eu, Er) and {[La(PhAc)(3)(H2O)] (.) 1/2bpy} (n) have been determined. Powder XRD determined all aqua complexes except RE = Er, Yb, Lu are isotypic linear polymers, with nine coordinate tricapped trigonal prismatic geometry. The lutetium complex is also a linear polymer, but with distinct metal centers, three eight coordinate, and one nine. Except for RE = La and Ce, the bpy analogues are isostructural symmetrical dimers, with nonacoordinate metal centers. The lanthanum complex is a nonacoordinate linear polymer with coordinated water and lattice bpy. Their corrosion inhibitory properties on mild steel, showed the highest efficiency for [Nd(PhAc)(3)(H2O)] (n) (55%). The lanthanum species with solvated 2,2 '-bipyridine proved a more effective corrosion inhibitor than the aqua version. Where both the aqua and bpy complexes were tested, the former performed better than the latter. These results provide insight into the effect of structure on the corrosion inhibiting properties of rare earth carboxylates.

Item ID: 66173
Item Type: Article (Research - C1)
ISSN: 1029-0389
Keywords: Rare earth, lanthanoid, carboxylate, metathesis, corrosion inhibitor, corrosion, mild steel, single-crystal XRD, Green chemistry
Copyright Information: © 2020 Informa UK Limited, trading as Taylor & Francis Group
Funders: Australian Research Council (ARC)
Projects and Grants: ARC grant DP200100568
Date Deposited: 25 Nov 2020 08:15
FoR Codes: 34 CHEMICAL SCIENCES > 3402 Inorganic chemistry > 340203 F-block chemistry @ 100%
SEO Codes: 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280105 Expanding knowledge in the chemical sciences @ 100%
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